Ventilating attachment for milk-can covers



July 3, 1928. 1,675.503

w. MOCALLUM v VENTILATING ATTACHMENT FOR MILK CAN COVERS Filed m 4, 1926 lilllllllllllll 29 HIHU' /e I LI I 22 Q/z/ /7 12 III/III/I I,

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Patented July 3, 1928 UNITED STATES,

WALLICE MCCALLUM, OF MINBURN, IOWA.

VENTILATING ATTACHMENT FOR MILK-CAN COVERS.

Application filed August 4, 1926. Serial No. 127,038.

The object of my invention is to provide a ventilating attachment which may be used in connection with a large number of milk can covers in commercial use, in such a manner that when the said cover and attachment is applied to the milk can, suflicient ventilation will be provided for milk within the can.

A further object is to provide a ventilating attachment to be used in connection with a milk can and its cover of simple, durable and inexpensive construction, which may be easily and quickly attached and placed in operative relation therewith with- 5 out altering the can or its cover.

A further object is to provide a ventilating attachment for milk can covers having a minimum number of parts, and so arranged that it may be easily and quickly cleaned and sterilized.

A further object is to provide a ventilat ing attachment for milk cans which is adapted to permit sufiicient ventilation, and at the same time exclude the elements of r the weather, dirt and insects.

I My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure 1 is a vertical sectional view through the top end of a milk can showing the manner in which my improved device is applied thereto, said device being also shown in section.

Figure 2 is a sectionalview of the same showing the ventilator used as a strainer.

Figure 3 is a vertical sectional view of a can and my improved device, showing an auxiliary attachment which may be used in connection with can covers of'certain types and different sizes.

The numeral indicates a milk can of ordinary construction, having a neck portion 11 terminating in an outwardly and upwardly extending flange portion 12. The numeral 13 indicates the preferred form of cover which is most commonly used. Said cover comprises a top portion 14 and an annular flange portion 15. Said flange portion 15 is designed to extend into the flange por-' tion 12 of the can 10 and to fit the inner surface of the neck portion 11. The top portion 14: is of such diameter as to entirely upwardly extending flange 19.

My improved ventilator comprises a flat annular body portion 17 of a diameter slightly greater than the diameter of the top of the flange 12. The outer edge of said body portion 17 is provided with a downwardly extending flange 18,.while the inner edge of the body portion 17 is provided with an The upper edge of the flange 19 is slightly curved outwardly and is provided with notches 20. The flange 19 is also provided with ventilating openings 21 which are preferably located about midway between the ends of said flanges. The lower end of the flange 19 is provided with an inwardly extending flange 22 which forms a support for a screen 23, which may be either detachably placed therein or soldered permanently into position." This screen may be of either woven wire or perforated sheet metal. 2 l

The body portion 17 'n operation is placed over the top of the flange 12 in a manner clearly illustrated. in the drawings. flange 18 extends downwardly over the upper edge of the flange 12. The cover 13 is then placed on the upper edge of the flange 19 with the flanges 15 extending outside of said flange 19. 011 account of the outwardly curved portion of the flange 19 it will be seen that a ventilating space 24 is provided between the members 15 and 19, the member 15 being slightly shorter than the flange 19 to permit air to circulate beneath the lower edge of the flange 15 up wardly between the flanges 19 and15 and through the openings 21 tothe interior of the can 10 through the screen 23, thereby providing means for ventilating the interior of the can. and at the same time excludingthe insects, dirt, etc. I

In Figure 3 I have illustrated a somewhat diflerent type of cover 25 which is provided with a very shallow flange 26, which is not deep enough to properly cover the openings 21. To provide means whereby the said cover 26 may be used in con nection with my ventilator without alters ingthe same, I have provided a sleeve 27 or the same diameter as the flange 15 of the can is cover 13. The said flange 27 is of the same depth as the flange 15. The upper end of the sleeve provided with a contracted portion 28 designed to receive the flange 26, thereby providing means whereby the cover 26 may be used in connection with my improved ventilator. It sometimes happens that an owner will have both types of covers, and by providing the sleeve 27 he will be able to use either type of cover, said sleeve being detachably mounted on the flange 19.

By providing the openings 21 substantially midway between the upper and lower edges of the flange 19, and providing the notches 20 in the upper edge of said flange, I have provided means whereby a natural circulation of air will take place within the can. It will readily be seen that when the filled with fresh warm milk, heated air and vapors will escape through the upper notches 20, while cooler air will enter through the openings 21. In this connection it should be understood that the milk cans are usually located in a draft, which will create a pressure in one side of the space 24, and a partial vacuum on the opposite side. This will also assist in forming a circulating current of air within the can. The flange 22 is so located that the screen 23 may be placed on the upper side of the flange 22 and the ventilator placed in an inverted position on the can, as shown in Figure 2. The screen 28 may be removed if so desired before the ventilator is placed in position.

Thus it will be seen I have provided a ventilating attachment for inilk cans of simple, durable and inexpensive construction, which may be easily and quickly ap plied to the commercial cans in common use without in any way altering or changing the can or its cover, and which will provide means whereby the can will be properly ventilated, and at the same time exclude the elements of the weather and foreign substances such as dirt and insects.

I claim as my invention:

7 1. A ventilating attachment for milk cans comprising a flat annular body memher havin its outer edge provided with a downwardly extending flange and its inner edge provided with an upwardly extending flange, the upper edge of which is provided with an outwardly extending portion, the last said flange having its upper edge provided with a series of notches and its body portion provided with openings located substantially midway between its lower and upper edges, and a screen mounted within said upwardly extending flange perpendicular to its vertical 2. A ventilating attachment for mllk cans comprising a flat annular body member having its outer edge provided with a downwardly extending flange and its inner edge provided with an upwardly extending flange, the upper edge of which is provided with an outwardly extending portion, the last said flange having its upper edge provided with a series of notches and its body portion provided with openings located substantially midway between its lower and upper edges, said upwardly extending flange having near its lower edgev an inwardly extending annular flange, and a screen detachably mounted on said flange.

3. A ventilating attachment for milk cans comprising a flat annular body member having its outer edge provided with a downwardly extending flange and its inner edge provided with an upwardly extending flange, said upwardly extending flange being provided with openings located substantially midway between its lower and upper edges, and a screen detachably mounted within said upwardly extending flange perpendicular to its vertical axis.

4t. A ventilating attachment ,for milk cans comprising'a flat annular body member having its outer edge providedwith a down- \vardly extending flange and its inner edge provided with an upwardly extending flange, the upper edge of said flange being provided with a series of notches and its body portion provided with openings located between its lower and upper edges, and a screen mounted horizontally within said upwardly extending flange.

A ventilating attachment for milk cans comprising a flat annular body member having its outer edge provided with a downwardly extending flange and its inner edge provided with an upwardly extending flange, the upper edge of said flange being provided with a. series of notches and its body portion provided with openings located between its lower and upper edges, and a screen mounted horizontally within said upwardly extending flange, a fcover supported on the upper edge of said upwardly extending flange, said cover being provided with a downwardly extending annular flange supported outside of said up wardlyextending flange a. slight distance and having its lower edge extended below the level of said openings.

Des Moines. Iowa, July 15, 1926.

WALLIC-E MCGALLUM. 

